SAB-17-105 July 21, 2017 A Company Safety Awareness Bulletin: Upgrading from CMD-2M, CMD-3M and CMD-4M CO Detectors to NEW CMD5-MD 12/24 vdc CO Alarms CMD-2M/3M CMD-4M CMD5-M Upgrade to CMD5-M CMD-2M or CMD-3M If you have CMD-2Ms or CMD-3Ms there are a few items you need to know to convert to the new CMD5-M: 1. The units mount on the wall or ceiling in the same manner but the hole spacing is slightly different. You can usually use the top hole, drill a new second bottom hole and fill the one old hole with filler or putty. However, be sure to use the pan head screws (flat bottom of head) to mount the new bracket – not the countersunk flat head screws used with the CMD-2M/3M back plate. CAUTION - The flat head screws may crack the new CMD5-M bracket when tightened! 2. If there are marks on the wall, an indentation from the old detector or a junction box in the wall you may need the optional adapter plate (P/N 100102 – specify white, black or ivory) to cover the area or opening since the CMD5-M is slightly shorter than the CMD-2M/3M. 3. The two power wires connect up the same way – be sure to use crimp connectors and wrap with electrical tape for a secure connection.
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Safety Awareness Bulletin: Upgrading from CMD-2M, CMD-3M ......Jul 21, 2017 · Upgrading from CMD-2M, CMD-3M and CMD-4M CO Detectors to NEW CMD5-MD 12/24 vdc CO Alarms CMD-2M/3M
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SAB-17-105
July 21, 2017
A Company
Safety Awareness Bulletin:
Upgrading from CMD-2M, CMD-3M and CMD-4M CO Detectors to NEW CMD5-MD 12/24 vdc CO Alarms
CMD-2M/3M
CMD-4M CMD5-M
Upgrade to CMD5-M
CMD-2M or CMD-3M
If you have CMD-2Ms or CMD-3Ms there are a few items you need to know to convert to the new CMD5-M:
1. The units mount on the wall or ceiling in the same manner but the hole spacing is slightly different. You
can usually use the top hole, drill a new second bottom hole and fill the one old hole with filler or putty.
However, be sure to use the pan head screws (flat bottom of head) to mount the new bracket – not the
countersunk flat head screws used with the CMD-2M/3M back plate. CAUTION - The flat head
screws may crack the new CMD5-M bracket when tightened!
2. If there are marks on the wall, an indentation from the old detector or a junction box in the wall you may
need the optional adapter plate (P/N 100102 – specify white, black or ivory) to cover the area or opening
since the CMD5-M is slightly shorter than the CMD-2M/3M.
3. The two power wires connect up the same way – be sure to use crimp connectors and wrap with
electrical tape for a secure connection.
Step-by-Step Instructions
Existing CMD-2M/3M Squeeze cover and remove Bend bottom corner Install new bracket with new
and unplug connector prongs outward and pan head screws
remove circuit board
Remove two screws and
bracket
New CMD5-M bracket Align holes and rotate detector CMD Adapter Plate
with optional mounting slightly clockwise to P/N 100102-W
plate attach CMD5 alarm
CMD-4M
If you have CMD-4M there are a few items you should know about converting to the new CMD5-M:
1. The units mount on the wall or ceiling in a similar manner with the same mounting holes. However,
be sure to use the pan head screws (flat bottom of head) to mount the new bracket – not the
countersunk flat head screws used with the CMD-4M back plate. CAUTION - The flat head
screws may crack the new CMD5-M bracket when tightened!
2. If there are marks on the wall, an indentation from the old detector or a junction box in the wall you
may need the optional adapter plate (P/N 100102 – specify white, black or ivory) to cover the
opening since the CMD5-M is slightly shorter than the CMD-4M.
3. The two wires connect the same way – be sure to use crimp connectors and wrap with electrical tape
for a secure connection.
4. If your units are interconnected the two additional wires get connected the same way as the old
CMD-4M. NOTE: All interconnected units must be the same – you cannot mix CMD-4Ms and
CMD5-MxIs.
Note the CMD5-M draws significantly less power (4 vs. 30 mA @ 12 vdc).
In addition to all of the great new features with the new CMD5-M CO Alarm, including the battery-powered
model, there is another major difference over the CMD-4M that we need to point out.
The CMD-4M-RLY is a “Relay” model that was used for:
- Interconnecting multiple units
- Shutting down a generator
- Both of the above
- Sending a signal to a third party monitoring system
The new CMD5-M works differently. You can use a standard stand-alone version, or an interconnect (“I”)
version if you are just connecting multiple units. This saves you the cost of the relay in every CO alarm.
If you are shutting down a generator, you need the interconnect (“I”) version AND an RCM-5 relay control
module. The advantage here is you only need one relay per boat, not one per CO Alarm – another cost savings.
If you are sending a closure signal to a third party alarm system, you need the interconnect (“I”) version AND
one RCM-5 relay module per monitoring zone. Again, the advantage here is you only need one relay per zone,
not one per CO Alarm – additional cost savings.
NOTE: 1. If CMD4-Ms are interconnected they all need to be replaced at the same time – you cannot
mix and match CMD4-Ms and CMD5-Ms, unless they are independent stand-alone units.
Also available in black
Model Stand-alone
Alarms
Interconnected
Alarms
Generator
Shutdown
Third Party
Alarm system
Old Style for
Reference
CMD-4M X
CMD-4M-RLY X X X
New Style
CMD5-MD X
CMD5-MDI X X X
CMD5-MB X
CMD5-MBI X X X
RCM-5
(Dry contact
closure only)
X
(Requires add’l
12/24V DC power
supply)
X
(Requires add’l
12/24V DC power
supply)
“I” - Interconnect version with two more wires than standard